Home / 20,415.12-30,619.89-5,621.91

Finding the Fourth Proportional to 20,415.12, 30,619.89 and 5,621.91

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Solution

The fourth proportional to 20,415.12, 30,619.89 and 5,621.91 is: 8,432.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.12 : 30,619.89 = 5,621.91 : x
  2. Step 2: Convert to fraction form
    20,415.12/30,619.89 = 5,621.91/x
  3. Step 3: Cross multiply
    20,415.12x = 30,619.89 × 5,621.91
  4. Step 4: Simplify right side
    20,415.12x = 172,142,265.79
  5. Step 5: Solve for x
    x = 172,142,265.79/20,415.12
  6. Step 6: Final answer
    x = 8,432.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.